Rob,
Aberdeen is a must see tank museum, one of the three best and largest in the world. It has an extensive collection with some unique vehicles. Most of the tanks are outside and there are information plaques that just say what the vehicles are, but not much else.
Their artillery collection is second to none, which includes two railroad guns. Also, there is an inside musuem with small arms and some great displays. The main problem with the museum is that it is run by a private fund and many of the tanks are need of restoration after being kept outside for so many years.
Ken